Question

Three law of newton and example

Answer 1

Answer:

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Explanation:

Newton's first law of motion: An object will remain at rest or in uniform motion in a straight line unless acted upon by an external unbalanced force.It may be seen as a statement of inertia,that objects will remain in their state of motion unless an unbalanced force to change its state..

Newton's second law can be formally stated as follow: The acceleration of an object as produced by a net force is directly proportional to magnitude of the net force,in the same direction as the net force,and inversely proportional to the mass of an object.

Newton's third law of motion:Every action, there is an equal and opposite reaction.

Answer 2

Explanation:

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1. Newton’s 1st law states that a body at rest or uniform motion will continue to be at rest or uniform motion until and unless a net external force acts on it.

• The crucial point here is that if there is no net force resulting from unbalanced forces acting on an object, then the object will maintain a constant velocity. If that velocity is zero, then the object remains at rest. And if an additional external force is applied, the velocity will change because of the force.

2. The second law of motion describes what happens to the massive body when acted upon by an external force. The 2nd law of motion states that the force acting on the body is equal to the product of its mass and acceleration.

• Newton’s second law describes precisely how much an object will accelerate for a given net force.

• Mathematically, we express the second law of motion as follows

$f \alpha \frac{dp}{dt}$

$f \alpha \frac{mv - mu}{t}$

$f \alpha \frac{(v - u)}{t}$

$f \alpha m.a$

$f = kma$

• In the equation, k is the constant of proportionality, and it is equal to 1 when the values are taken in SI unit. Hence, the final expression will be,

F=ma

3. The third law of motion describes what happens to the body when it exerts a force on another body.

• The Newton’s 3rd law states that for every action there is an equal and opposite reaction.

• When two bodies interact, they apply force on each other that are equal in magnitude and opposite in direction. To understand Newton’s third law with the help of an example, let us consider a book resting on a table. The book applies a downward force equal to its weight on the table. According to the third law of motion, the table applies an equal and opposite force on the book. This force occurs because the book slightly deforms the table; as a result, the table pushes back on the book like a coiled spring. Newton’s third law of motion implies the conservation of momentum.

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